Wireless signaling system



June 8 1926.

H. J. ROUND ET AL WIRELESS SIGNALING SYSTEM inal Filed March so, 1921vwentoz my J. ROUND AND k. MHELLAN 11164161 m 3% lot Q QQ d/W PatentedJune 8, 1926.

"UNITED STATES PATENT OFFICE.

HENRY 3'. ROUND, OF LONDON, AND ARCHIBALD MGLELLAN, 0F SWANSEA, ENGLAND,ASSIGNORS TO RADIO CORPORATION OF AMERICA, A CORPORATION OF DELAWARE.

WIRELESS SIGNALING SYSTEM.

Original application filed March 30, 1921, Serial No. 457,152, and inGreat Britain April 8, 1920. Patent No. 1,517,854, dated December 2,1924- 1Divided and this application filed April 23, 1924. Serial Thisapplication is a division of our Patent No. 1,517 ,654, of December 2,1924., for

wireless signaling systems.

When a valve system consisting of a valve or valves and an oscillatingcircuit, is oscillating various accidental circumstances may prevent theaerial from oscillating, .or may produce a variation in wave lengthwhich will be harmful to the valve or valves or to the reception ofsignals. It is an object of this invention to obviate the possibility ofsuch harm. l

It is a further object of this invention to provide a means formaintaining the aerial system in oscillation at a constant frequency.The manner of carrying out the objects of this invention will beapparent from the fol-.

lowing description taken in connection with the drawing in which: I

The figure is a diagrammatic view illustrating the invention.

Included in the antenna circuit is a variometer L which is designed toincrease or decrease theinductance of the antenna circuit in the usualmanner. The oscillating circuits-F and E are coupled to the aerialcircuit, these circuits being tuned to a frequency greater than, andless than, the frequency of the antenna circuit respectively by apredetermined amount. These circuits F and E are provided with some suchmeans as a variable condenser whereby their respective frequencies aremaintained at two predetermined values. These circuits F and E areprovided with the hot wire elements T andT which are in turn connectedto the movable contact C. Connected to the contact members C and C isthe relay G. The relay G is provided with a local circuit havingsolenoids H and H which are mechanically joined to the armature L.

The operation of'the device is as follows:

In the event that the frequencies in the antenna circuit is altered fromthe value at which it is designed to operate, a current will fiow ineither of the clrcuits F or E as the case may be, depending upon whetherthe frequency of the aerial has increased ordecreased to resonance withthe circuits F i registration with either contact G or C depend ng uponwhether the current is generated in the circuit F or the circuit E, orin other words depending upon whether thefrequency of the antennacircuit has been decreased or increased. Thus the relay G is -or assmall a variation in the frequency of the antenna circuit as may bedeemed to be desirable. Whatever these adjustments may be, the, mode ofoperation of the device is the same.

Having thus described our invention we desire to secure by LettersPatent of the United States the following:

1. In wirless signaling system the combination of an antenna, a variabletuning element associated therewith the means responsive to currentsenergizing said antenna for maintainin the tuning thereof substantiallyconstant y means of said element.

2. A wireless signaling system comprising an aerial, a plurality ofauxiliary oscillating circuits coupled to the aerial and differingslightly in tune therefrom and means controlled by the flow of currentsin the said circuits or restoring the tune of the aerial to normal.

3. A wireless signaling system comprising an aerial, an auxiliaryossicllating circuit coupled to the aerial and tuned slightly above thenormal frequency thereof, an additional auxiliary oscillating circuitcoupled to said aerial and tuned slightly below the normal frequencythereof and means controlled by the fiowof current in said circuits forrestoring the tune of the aerial to normal.

4. In a wireless signaling system, an aerial circuit, variable means tomaintain the turn ing of said circuit substantially constant, and meansassociated with said aerial circuit to govern the operation ofsaidvariable means.

5. In a wireless signaling system, an aerial circuit including avariable tuning element, a plurality of oscillating control circuitscoupled to said aerial circuit, each of said control circuits beingtuned to a frequency differing from that of the aerial circuit by apredetermined amount, a relay associated with said control circuits,means associated with the relayand responsive to each of said controlcircuits to operate the variable tuning element when the frequency ofthe aerial circuit is changed to that of any one of the controlcircuits, whereby the frequency of the .areial circuit is restored toits normal value.

6. In a wireless signaling system having an aerial circuit, means tomaintain the tuning of the aerial substantaially constant comprising, avariometer, a plurality of circuits coupled to saidaerial circuit eachof said plurality of circuits being tuned to a frequenc different fromthat of the aerial by a pre etermined amount, and means to actuate thevariometer when the frequency of the aerial circuit is changed to thefrequency of any one of said plurality of circuits, whereby thefrequency of the aerial circuit is restored to its normal value.

7. In a wireless signaling system having an aerial circuit, means tomaintain the tuning of said aerial circuit substantially constantcomprising a variometer, a control circuit having a fre uency less thanthe frequency of the aerial circuit, a second control circuit having afrequency greater than the frequency of the aerial circuit, both saidcontrol circuits being coupled to the aerial circuit whereby a currentwill fiow in one of said control circuits whenthe frequency of theaerial circuit changes to the frequency of one of the control circuits,each of said circuits being provided with a hot wire element which isresponsive to the flow of current therein, a movable contact associatedwith said hot wire elements, and means under control of said movablecontact to actuate the variometer.

HENRY'JOSEPH ROUND. ARCHIBALD MCLELLAN

